Appendix B: Glossary

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Absolutely dry also called "oven dry" (= b.d. bone dry)

AP Waste paper

APHA American Public Health Association

APMP Alkaline peroxide mechanical pulp (special form of CTMP).

BLS Black liquor solids.

Brightness Measure of the "whiteness" of the paper, expressed as a percentage of "absolutely" white = 100% light reflection under blue light of a certain wavelength. Very bright papers have a brightness of 85 - 90%, newsprint around 60 - 65%.

Corrugating medium Relatively strong paper for the corrugated central layer of corrugated board.

De-inking Removal of printing inks from printed waste paper.

Dissolving pulp High quality chemical pulp for further chemical processing (films, fibers, etc.)

EPA The Environmental Protection Agency, USA.

"Fresh" pulp "Virgin" pulp obtained from the various raw (wood, etc.) fibre materials (as opposed to waste paper pulp).

Lime burning kiln Installation for chemical recovery in sulphate and soda pulp mills for the regeneration of burnt lime for the reprocessing of dissolving chemicals.

Mg and Ca bisulphite Chemical pulping process.

magnefite process

Refiner Grinding machine for the pulping and fibrillation of fibrous raw materials. Mostly disc refiners with toothed or grooved counter-revolving discs at low adjustable distances.

Rigidity Resistance to bending and folding of paper and board. Important for pressure loads where used for packaging purposes.

Shelf life Generic term for paper and board which concerns resistance to light, moisture and resistance to heat.

Smelt-dissolving tank Dissolving tank for ash from black liquor burning (sulfate process).

Strength For paper and board, a non-scientific generic term for tensile strength (breaking length), bursting strength, folding coefficient, edge tearing resistance.

TRS Total reduced sulphur, generic term for H2S and organic compounds with bivalent sulphur, e.g. mercaptans. Usually have an unpleasant odour at the tiniest concentrations.

Yield Ratio of quantity of product (absolutely dry) to quantity of raw material (absolutely dry) expressed as a percentage. Because in the trade, pulp is calculated at 90% dry matter content (10% moisture, called "air dry"), the yield can also be given on this basis. Vegetable raw materials contain from around 30% (for straw) to around 50% (for wood) pulp; yields are limited by this.

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